Tap on the red Record button, wait four beats while the metronome clicks, and then play your part. You have to play it correctly just once. Tap Stop when you're done.
Now tap on the Tracks button, which appears just to the left of the Back button at the top of the screen. This returns you to the Tracks screen. Your bass part will appear just under the drum part. Double-tap on its green bar and from the list of options that appears, tap Loop. The bass track will extend to the end of the part and contain copies of the riff you played. Tap Play to hear it.
Rock the guitar
Tap once again on the Instruments entry and this time choose Smart Guitar. Tap on the Acoustic guitar icon and choose Hard Rock. If you like, strum the strings and rock out for awhile. When you've had enough, tap just on the chord headings — where it says E, A, and Bm. Notice that this plays a chord, no strumming required. You're going to tap these headings to record your guitar part. Specifically, using the "Louie Louie" rhythm you'll tap E E E, A A, Bm Bm Bm, A A. When you're ready, tap the Record button, wait for the four clicks, and play your part. Tap Stop when you're done.
Return to the Tracks screen and double-tap on the guitar part. As before, tap on Loop. Tap Play. Awesome, yes?
Bring on the B3
Let's fill it out even more by adding an organ part. Tap on Instruments and choose Smart Keyboard. Tap on Grand Piano and choose Classic Rock Organ. Play a few chords by tapping on the headings. Above the chord headings you'll see a Rotation switch. Tap where it says Fast. Now tap a few chords. Hear the difference? That's due to the rotating speaker (Leslie) effect you just applied.
For this part we're not going to play the "Louie Louie" rhythm. Instead, we'll play just one chord each time it occurs. So, you'll play E, A, Bm, A (so, a chord every two beats). Click record, wait for the clicks, and do your bit.
Go back to the Tracks screen and tap Play to listen. What? You say your timing is off? Let's fix it.
Tap on the organ icon on the left side of the Tracks screen and then tap the Edit icon (the item just to the right of the Loop icon). This should produce the Classic Rock Organ editing pane. Tap on Quantization and in the Quantization pane tap on 1/4 Note. Tap outside the pane to dismiss it. Now play your song and you'll see that the organ part lines up nicely because it's been aligned with an invisible rhythmic grid.
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